Rajasthan Technical University 2011-6th Sem B.E Electronics & Communication Engineering B.tech (Microwave Engineering II), - Question Paper

Q1 (A).How a microwave(MW) signal is detected. discuss any method in detail with proper diagram.
(B).Explain the method for measuring the S-parameter.
OR
(A).explain how a MW poer is measured. discuss ny one method for power measurement in detail.
(B).Explain freq. measurement of a MW signal.

Q2 (A).define different kinds of loses in microstrip(MS) lines.
(B).a certain kind of MS line has foll. parameters-: Er=5.23 , h=7mils, t=2.8mils, w=10 mils
compute the characteristic impedence Z0 of the line.
OR
(A). describe slot line & how they differ from MS lines.
(B). discuss transition & bends in MS lines.

Q3 (A). what do u mean by S-matrix & how it differ from impe. & admit. matrix.
(B).explain usefulness of signal flow graph for analysis of MW sig.
OR
(A). discuss discontinuties in MW n/w. discuss with help of rectangular waveguide.
(B). obtain the Z-para. of a T port Z n/w.
Q4 (A).define working of tunnel diode wit its enrgy band diag. and discuss its -ve resis. charac.
(B).an IMPATT diode has foll charac-: Vd=2*10^7 cm/s , L= 6*10^-6, Vo max=100V , Io max=200 mA
, eficiency= 15% , Vbd=90V
--> calculate max CW power in watt.
--> the resonant freq. in GHz
OR
(A). Expalin modes of operation in gunn diode@ discuss characteristic in every mode.
(B). a certain GaAs MESFET has the foll. para -: Rg= three ohm , Ri=Rs=2.5 ohm, Gm=50 m mho,
Cgs=0.60pF, Rd=450 ohm.
--> obtain cutoff freq.
--> the max. operating freq.

Q5 (A). describe diff. MMic fabrication technique.
(B). list all material used for MMIC.
OR
(A). define MOSFET fabrication process.
(B). List all advantages & difficulty of MMIC.

Earning:   Approval pending.